a radar sends a signal to an aeroplane at a distance 300 km away,with a speed of 3×108 m/s (3 ×10 to the power 8 m/s) . After how much time is the signal received back after reflecting from the aeroplane?
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Answer:
Total distance travelled by signal= 2d
t=2d/v
=2×300km/3×10⁸m/s.
=t=2×3×10⁵m/3×10⁸m/s
=t=2×10⁵×10-⁸
=t=2×10-³seconds.
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